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    Gas Direct Injection - what are the pitfalls for airplane conversions?

    With GDI using highly compressed fuel, it seems likely that this would prevent its use at higher altitudes. But I'm not sure about this, perhaps the common rail system and injectors are built strong enough to be stable even at higher altitudes. Does anyone have knowledge about this? The reason...
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    Would You Be Interested in Building From Plans a DA20-like Airplane if...

    Total build time = 1500 and total cost = $30k More information about the DA20 here: Diamond DA20 - Wikipedia, the free encyclopedia Why Buy DA20 | Diamond Aircraft Specs and mission type in summary: - Safe and stable (good for low-time pilots) - Two-place - Efficient - Good (not great)...
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    Torsional Vibration Question

    Just read the sticky on TV. It is still not clear to me if there is a relationship between the rpm of the shaft and the overall force of the vibration. In a straight-4 engine would the torsional vibration be worse at higher rpms than the same type engine at lower rpms at the same power. In other...
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    Collaborative Design Challenge – Working Together to Create a Plans-Built Design

    Warning!!! Long wordy post ahead! As the title says this thread is an attempt to launch group collaboration on an airplane design of a specific type. Before going into what that specific type is for this particular project, and the details of the project itself, I want to point out that this...
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    Reverse Engineering an Existing Commercial Design

    There are several great composites airplanes out there such as the Cirrus, Diamond, and Flight Design. All these planes new are well over $100k, I believe. I was wondering how difficult it would be to copy the design for the purpose of building ones own airplane for personal use. The raw...
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    Safest Type of Flying

    In doing some research about airplane safety I originally assumed that a sailplane would be much safer than a powered plane but found statistically this is not true. In looking at Hang Gliders is appears that they are much safer than sailplanes or powered. Is that because they go so slow and...
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    Long EZ Mold Construction - Question

    I read much of the very informative sticky on composites, still more I need to read. But I have a question about why one can't use molds to construct a Long EZ. It was pointed out to me by a friend that a significant portion of the time it takes to build an ez is in the finishing of the...
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